* new module: openapi-generator-core
* templating engine adapters to support extension (currently only Handlebars)
* new `-e` templating engine CLI option
* adapt Generator to process Template with the passed TemplatingEngineAdpater
* add a MustacheEngineAdapter to the codegen in the unit tests
* force default MustacheEngineAdapter
* copy new core module in the root Dockerfile
* add processTemplatingEngine to CodegenConfig, to be overriden by Codegen classes if needed
* support multiple file extensions per templating engine adapter
* Extends handlebars experimental adapter with explicit contextual resolvers (e.g. map processing)
* Add new openapi-generator-core/pom.xml to release_version_update.sh
* A detailed message will be logged on missing handlebars helper
* Adds README documentation around template default and beta options
* Moves mustache package under new templating package
* Include built-in handlebars helpers which require explicit registration, and custom `startsWith` helper.
* update release version, disabled ensure up to date script
* update release table
* update stable version to 3.2.3
* update samples/meta-codegen/lib/pom.xml and release_version_update.sh
* add new bash script for release version update
* update version using the bash script
* Fix shippable build
Modify `artifactId` of `CI/pom.xml.shippable` to be `openapi-generator-shippable-pom`
* Comment ensure-up-to-date
* add shippable to the release script
* Updates README based on new release changes (#271)
The release management changes moved from maven-publish (newer plugin)
to maven (older plugin, only one that works currently with signing).
This updates docs in the samples/local-spec project with current
directions.
Also:
* Includes sonatype releases/snapshots on repo lookup
* Adds openApiGeneratorVersion property
